Kennedy was a London police officer who spent years on the international activist scene pretending to be an environmentalist and an anarchist. He was unmasked in 2011, with the aid of spreadsheets and through old fashion detective work, by a group of activists who spent years trying to reveal police informants in their midst.

On Tuesday three senior judges vacated the convictions of 29 activists who participated in the 2008 action. The judges had harsh words for the conduct of the prosecutor who brought the charges against the activists and who withheld evidence that would have exposed Kennedy as a source. Kennedy was present at activist planning meetings, and played a crucial role by driving a van and transporting activists. Without Kennedy’s involvement, the action would not have been able to take place when it did. The ongoing legal fallout from this case alone is estimated at least 1 million pounds or nearly 2 million dollars.